diff --git a/src/canvas.rs b/src/canvas.rs
new file mode 100644
index 0000000..ab401e7
--- /dev/null
+++ b/src/canvas.rs
@@ -0,0 +1,95 @@
+#[allow(unused_imports)]
+use log::{debug, error, info, trace, warn};
+
+use crate::{
+    io::{Key, Scroll},
+    sprite::{Sprite, TextureSprite, TextSprite, ShapeSprite},
+    texture::Texture,
+    utils::{Size, Pixel, Position},
+};
+
+use std::{
+    rc::Rc,
+    cell::RefCell,
+};
+
+//--Canvas struct-----------------------------------------------------------------------------------
+pub struct Canvas {}
+
+impl Canvas {
+
+    //--Create functions--
+    pub fn create_texture_sprite(&mut self, _size: Size, _scale: f32) -> TextureSprite {
+        unimplemented!();
+    }
+
+    pub fn create_text_sprite(&mut self, _size: Size, _scale: f32) -> TextSprite {
+        unimplemented!();
+    }
+
+    pub fn create_shape_sprite(&mut self) -> ShapeSprite {
+        unimplemented!();
+    }
+
+    pub fn create_texture(&mut self, _size: Size, _background: Option<Pixel>) 
+        -> Rc<RefCell<Texture>> 
+    {
+        unimplemented!();
+    }
+
+    pub fn create_texture_from_file(&mut self, 
+                                    _pos: Position, 
+                                    _file: &'static str,
+                                    _background: Option<Pixel>) 
+        -> Rc<RefCell<Texture>> 
+    {
+        unimplemented!();
+    }
+
+    //--Output functions--
+    pub fn draw<S: Sprite>(&mut self, _sprite: S) {
+        unimplemented!();
+    }
+
+    pub fn set_clear_color(&mut self, _color: Pixel) {
+        unimplemented!();
+    }
+
+    pub fn clear(&mut self) {
+        unimplemented!();
+    }
+
+    //--Input functions--
+    pub fn close_requested(&self) -> bool {
+        unimplemented!();
+    }
+
+    pub fn key_pressed(&self, _key: Key) -> bool {
+        unimplemented!();
+    }
+
+    pub fn key_released(&self, _key: Key) -> bool {
+        unimplemented!();
+    }
+
+    pub fn get_key_presses(&self) -> Key {
+        unimplemented!();
+    }
+
+    pub fn get_key_releases(&self) -> Key {
+        unimplemented!();
+    }
+
+    pub fn get_mouse_position(&self) -> Position {
+        unimplemented!();
+    }
+
+    pub fn get_mouse_scroll(&self) -> Scroll {
+        unimplemented!();
+    }
+
+    pub fn update(&mut self) {
+        unimplemented!();
+    }
+}
+
diff --git a/src/io.rs b/src/io.rs
new file mode 100644
index 0000000..fb5d940
--- /dev/null
+++ b/src/io.rs
@@ -0,0 +1,19 @@
+#[allow(unused_imports)]
+use log::{debug, error, info, trace, warn};
+
+use bitflags::bitflags;
+
+//--Key enum----------------------------------------------------------------------------------------
+bitflags! {
+    pub struct Key: u128 {
+        const A = 0x1 << 0;
+        const B = 0x1 << 1;
+    }
+}
+
+//--Scroll struct-----------------------------------------------------------------------------------
+pub struct Scroll {
+    x: f32,
+    y: f32,
+}
+
diff --git a/src/shape.rs b/src/shape.rs
new file mode 100644
index 0000000..1e1c761
--- /dev/null
+++ b/src/shape.rs
@@ -0,0 +1,15 @@
+#[allow(unused_imports)]
+use log::{debug, error, info, trace, warn};
+
+use crate::utils::Size;
+
+//--Shape trait-------------------------------------------------------------------------------------
+pub enum Shape {
+    Rectangle (Rectangle),
+}
+
+//--Rectangle struct--------------------------------------------------------------------------------
+pub struct Rectangle {
+    pub size: Size,
+}
+
diff --git a/src/sprite.rs b/src/sprite.rs
new file mode 100644
index 0000000..2c81cca
--- /dev/null
+++ b/src/sprite.rs
@@ -0,0 +1,145 @@
+#[allow(unused_imports)]
+use log::{debug, error, info, trace, warn};
+
+use crate::{
+    shape::Shape,
+    texture::Texture,
+    utils::{Pixel, Position, Size},
+};
+
+use cgmath::Matrix4;
+
+use std::{
+    rc::Rc,
+    cell::RefCell,
+    slice::{Iter, IterMut},
+};
+
+//--Sprite trait------------------------------------------------------------------------------------
+pub trait Sprite {
+    
+    fn set_position(&mut self, pos: Position);
+    fn set_rotation(&mut self, rot: f32);
+    fn set_alpha(&mut self, alpha: u8);
+    fn set_scale(&mut self, scale: f32);
+}
+
+//--TextureSprite struct----------------------------------------------------------------------------
+pub struct TextureSprite {
+    matrix: Matrix4<f32>,   
+    size: Size,
+    texture: Rc<RefCell<Texture>>,
+}
+
+impl TextureSprite {
+
+    pub fn set_texture(&mut self, _texture: Rc<RefCell<Texture>>, _offset: Option<Position>) {
+        unimplemented!();
+    }
+
+    pub fn set_pixel(&mut self, _pos: Position, _pix: Pixel) {
+        unimplemented!();
+    }
+
+    pub fn iter(&self) -> Iter<'_, Pixel> {
+        unimplemented!();
+    }
+
+    pub fn iter_mut(&mut self) -> IterMut<'_, Pixel> {
+        unimplemented!();
+    }
+}
+
+impl Sprite for TextureSprite {
+    
+    fn set_position(&mut self, _pos: Position) {
+        unimplemented!();
+    }
+
+    fn set_rotation(&mut self, _rot: f32) {
+        unimplemented!();
+    }
+
+    fn set_alpha(&mut self, _alpha: u8) {
+        unimplemented!();
+    }
+
+    fn set_scale(&mut self, _scale: f32) {
+        unimplemented!();
+    }
+}
+
+//--TextSprite struct-------------------------------------------------------------------------------
+pub struct TextSprite {
+    matrix: Matrix4<f32>,
+    size: Size,
+    text: &'static str, //TODO: temporary
+}
+
+impl TextSprite {
+
+    pub fn set_text(&mut self, _text: &'static str) {
+        unimplemented!();
+    }
+
+    pub fn set_color(&mut self, _color: Pixel) {
+        unimplemented!();
+    }
+}
+
+impl Sprite for TextSprite {
+    
+    fn set_position(&mut self, _pos: Position) {
+        unimplemented!();
+    }
+
+    fn set_rotation(&mut self, _rot: f32) {
+        unimplemented!();
+    }
+
+    fn set_alpha(&mut self, _alpha: u8) {
+        unimplemented!();
+    }
+
+    fn set_scale(&mut self, _scale: f32) {
+        unimplemented!();
+    }
+}
+
+//--ShapeSprite struct-------------------------------------------------------------------------------
+pub struct ShapeSprite {
+    matrix: Matrix4<f32>,
+    size: Size,
+    shape: Shape,
+}
+
+impl ShapeSprite {
+
+    pub fn set_shape(&mut self, _shape: Shape) {
+        unimplemented!();
+    }
+
+    pub fn set_color(&mut self, _color: Pixel) {
+        unimplemented!();
+    }
+}
+
+impl Sprite for ShapeSprite {
+    
+    fn set_position(&mut self, _pos: Position) {
+        unimplemented!();
+    }
+
+    fn set_rotation(&mut self, _rot: f32) {
+        unimplemented!();
+    }
+
+    fn set_alpha(&mut self, _alpha: u8) {
+        unimplemented!();
+    }
+
+    fn set_scale(&mut self, _scale: f32) {
+        unimplemented!();
+    }
+}
+
diff --git a/src/texture.rs b/src/texture.rs
new file mode 100644
index 0000000..9b0256a
--- /dev/null
+++ b/src/texture.rs
@@ -0,0 +1,25 @@
+#[allow(unused_imports)]
+use log::{debug, error, info, trace, warn};
+
+use crate::utils::{Pixel, Position};
+
+use std::slice::{Iter, IterMut};
+
+//--Texture struct----------------------------------------------------------------------------------
+pub struct Texture {}
+
+impl Texture {
+
+    pub fn set_pixel(&mut self, _pos: Position, _pix: Pixel) {
+        unimplemented!();
+    }
+
+    pub fn iter(&self) -> Iter<'_, Pixel> {
+        unimplemented!();
+    }
+
+    pub fn iter_mut(&mut self) -> IterMut<'_, Pixel> {
+        unimplemented!();
+    }
+}
+
diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..d9e10ac
--- /dev/null
+++ b/src/utils.rs
@@ -0,0 +1,48 @@
+#[allow(unused_imports)]
+use log::{debug, error, info, trace, warn};
+
+//--Position struct---------------------------------------------------------------------------------
+pub struct Position {
+    pub x: u32, 
+    pub y: u32,
+}
+
+//--Size struct-------------------------------------------------------------------------------------
+pub struct Size {
+    pub w: u32,
+    pub h: u32,
+}
+
+//--Pixel struct------------------------------------------------------------------------------------
+#[derive(Copy, Clone)]
+struct Rgba {
+    r: u8,
+    g: u8,
+    b: u8,
+    a: u8,
+}
+
+pub union Pixel {
+    flat: u32,
+    rgba: Rgba,
+}
+
+impl Pixel {
+    
+    pub fn rgb(r: u8, g: u8, b: u8) -> Pixel {
+        Pixel {
+            rgba: Rgba{r, g, b, a: 255},
+        }
+    }
+}
+
+//--Color values------------------------------------------------------------------------------------
+#[non_exhaustive]
+pub struct Color;
+
+impl Color {
+    pub const WHITE: Pixel = Pixel {flat: 0x000000ff};
+    pub const BLACK: Pixel = Pixel {flat: 0xffffffff};
+}
+
+